Abstract
A technique for NO{sub x} reduction for combustion processes was examined. The technique is based on injecting ozone into the NO{sub x} containing flue gas where it will react with NO{sub x}, forming an anhydride of nitric acid, N{sub 2}O{sub 5}. N{sub 2}O{sub 5} is easily removed later using a water scrubber. The technique was tested on a gas engine based CHP unit and a CHP unit based on a straw-fired boiler and a steam turbine. It was found that: 1) NO{sub x} emissions can be reduced by more than 95 % by adding ozone to the flue gas; 2) The technique is applicable on flue gas from biomass combustion despite the presence of compounds such as SO{sub 2} and HCl; 3) Reduction of NO{sub x} emissions requires approximately half as much O{sub 3} when it is applied to the natural gas fired engine unit compared to the straw-fired boiler unit; 4) The higher O{sub 3} consumption on straw-fired units is due both to higher flue gas temperature and to larger NO{sub x} fluctuations in the flue gas compared to the gas engine unit; 5) For the gas engine unit the formaldehyde emission was reduced by 60%; 6) SO{sub 2}
More>>
Stamate, E;
Chen, W;
Michelsen, P K;
[1]
Joergensen, L;
Jensen, T K;
Kristensen, P G;
Tobiasen, L;
Simonsen, P
[2]
- Risoe DTU. PLF, Roskilde (Denmark)
- Dansk Gasteknisk Center, Hoersholm (Denmark)
Citation Formats
Stamate, E, Chen, W, Michelsen, P K, Joergensen, L, Jensen, T K, Kristensen, P G, Tobiasen, L, and Simonsen, P.
Pilot test and optimization of plasma based DeNO{sub x}. Final report.
Denmark: N. p.,
2010.
Web.
Stamate, E, Chen, W, Michelsen, P K, Joergensen, L, Jensen, T K, Kristensen, P G, Tobiasen, L, & Simonsen, P.
Pilot test and optimization of plasma based DeNO{sub x}. Final report.
Denmark.
Stamate, E, Chen, W, Michelsen, P K, Joergensen, L, Jensen, T K, Kristensen, P G, Tobiasen, L, and Simonsen, P.
2010.
"Pilot test and optimization of plasma based DeNO{sub x}. Final report."
Denmark.
@misc{etde_1008026,
title = {Pilot test and optimization of plasma based DeNO{sub x}. Final report}
author = {Stamate, E, Chen, W, Michelsen, P K, Joergensen, L, Jensen, T K, Kristensen, P G, Tobiasen, L, and Simonsen, P}
abstractNote = {A technique for NO{sub x} reduction for combustion processes was examined. The technique is based on injecting ozone into the NO{sub x} containing flue gas where it will react with NO{sub x}, forming an anhydride of nitric acid, N{sub 2}O{sub 5}. N{sub 2}O{sub 5} is easily removed later using a water scrubber. The technique was tested on a gas engine based CHP unit and a CHP unit based on a straw-fired boiler and a steam turbine. It was found that: 1) NO{sub x} emissions can be reduced by more than 95 % by adding ozone to the flue gas; 2) The technique is applicable on flue gas from biomass combustion despite the presence of compounds such as SO{sub 2} and HCl; 3) Reduction of NO{sub x} emissions requires approximately half as much O{sub 3} when it is applied to the natural gas fired engine unit compared to the straw-fired boiler unit; 4) The higher O{sub 3} consumption on straw-fired units is due both to higher flue gas temperature and to larger NO{sub x} fluctuations in the flue gas compared to the gas engine unit; 5) For the gas engine unit the formaldehyde emission was reduced by 60%; 6) SO{sub 2} emissions are eliminated by the deNO{sub x} unit. It can be concluded that at present the plasma deNO{sub x} process suffers from too high capital and operating costs and too low plant operating time to be an attractive alternative for gas engine CHP plants. Furthermore, there is only a small gap of approx. 25 % between the specific ozone consumption obtained at the pilot test in Ringsted and the theoretically achievable value. This difference is too small to have a major impact on process economy in case of an optimized deNO{sub x} process. At straw fired plants the technology tends to be more promising for several reasons: 1) Significant potential for optimizing specific ozone consumption. 2) Larger NO{sub x} reduction due to the fact that higher concentration levels in the flue gas generate higher income from e.g. fertilizer sales. 3) Reduced or zero SO{sub 2} taxes. 4) Enhanced thermal efficiency generates higher income heat to domestic users. (LN)}
place = {Denmark}
year = {2010}
month = {Dec}
}
title = {Pilot test and optimization of plasma based DeNO{sub x}. Final report}
author = {Stamate, E, Chen, W, Michelsen, P K, Joergensen, L, Jensen, T K, Kristensen, P G, Tobiasen, L, and Simonsen, P}
abstractNote = {A technique for NO{sub x} reduction for combustion processes was examined. The technique is based on injecting ozone into the NO{sub x} containing flue gas where it will react with NO{sub x}, forming an anhydride of nitric acid, N{sub 2}O{sub 5}. N{sub 2}O{sub 5} is easily removed later using a water scrubber. The technique was tested on a gas engine based CHP unit and a CHP unit based on a straw-fired boiler and a steam turbine. It was found that: 1) NO{sub x} emissions can be reduced by more than 95 % by adding ozone to the flue gas; 2) The technique is applicable on flue gas from biomass combustion despite the presence of compounds such as SO{sub 2} and HCl; 3) Reduction of NO{sub x} emissions requires approximately half as much O{sub 3} when it is applied to the natural gas fired engine unit compared to the straw-fired boiler unit; 4) The higher O{sub 3} consumption on straw-fired units is due both to higher flue gas temperature and to larger NO{sub x} fluctuations in the flue gas compared to the gas engine unit; 5) For the gas engine unit the formaldehyde emission was reduced by 60%; 6) SO{sub 2} emissions are eliminated by the deNO{sub x} unit. It can be concluded that at present the plasma deNO{sub x} process suffers from too high capital and operating costs and too low plant operating time to be an attractive alternative for gas engine CHP plants. Furthermore, there is only a small gap of approx. 25 % between the specific ozone consumption obtained at the pilot test in Ringsted and the theoretically achievable value. This difference is too small to have a major impact on process economy in case of an optimized deNO{sub x} process. At straw fired plants the technology tends to be more promising for several reasons: 1) Significant potential for optimizing specific ozone consumption. 2) Larger NO{sub x} reduction due to the fact that higher concentration levels in the flue gas generate higher income from e.g. fertilizer sales. 3) Reduced or zero SO{sub 2} taxes. 4) Enhanced thermal efficiency generates higher income heat to domestic users. (LN)}
place = {Denmark}
year = {2010}
month = {Dec}
}